Residual fluid detection apparatus for detecting fluid at the bottom of a bottle using both IR and visible light
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United States of America Patent
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Jun 1, 1993
Grant Date -
N/A
app pub date -
Aug 19, 1991
filing date -
Aug 20, 1991
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A light source irradiates the bottom of a bottle with light that contains visible light rays and infrared rays. Two photoelectric conversion sensors remove the light passing through the bottle bottom from the light source. An optical filter which passes only infrared rays placed in front of the light receiving surface of one of the photoelectric conversion sensors, and the outputs from the two photoelectric conversion sensors are compared directly and a signal is provided when a difference between the outputs exceeds a predetermined value.
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